[Christopher Deangelus]

Are you creating a flash player with the video embedded in the flash project, or are you referencing the .FLV (the actual video file) in the flash player? If you are embedding the FLV inside the .fla (and subsequently the swf player) you will get audio desyncs. Make the .fla (and subsequently the .swf) file reference the .FLV file externally, and your problem should disappear.